812 Fuel Gage

  • Lee Carr
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19 May 2019 16:12 #37265 by Lee Carr
812 Fuel Gage was created by Lee Carr
My fuel/oil gage goes to "full" on both positions despite reality. There are no shorts, both senders have realistic resistances (about 120 ohm empty, abut 0 full) and all wires are intact. There are shorts to ground in the gage and its coils are intact. I can't figure it out. Help.

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  • Lee Carr
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19 May 2019 16:13 #37266 by Lee Carr
Replied by Lee Carr on topic 812 Fuel Gage
There are NO shorts to ground in the gage itself - sorry for the confusion in the original message.

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19 May 2019 16:29 #37267 by 1748 S
Replied by 1748 S on topic 812 Fuel Gage
When you state "both positions".. Are you saying both the oil level and the gas tank level show full no matter what levels are really in there? If so you might disconnect the oil level sender and then the gas tank sender to see if either of them are causing this issue. My guess is the oil level sender in the oil pan has failed but testing will tell for sure. Both my gas tank and oil pan sender are apart on my bench if you need pictures of the internals.


Gary Parsons

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  • Lee Carr
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19 May 2019 17:13 #37269 by Lee Carr
Replied by Lee Carr on topic 812 Fuel Gage
With either or both senders disconnected, the gage reads zero as it should with no ground at all. With either connected to the gage (even one at a time) and with either manually rotated to their "empty" positions, the gage reads full as if there is a short through the senders. However, there is no short through either sender - they have matching and what seem like correct resistances - about 130 at empty and near zero at full. Further, there is no short at the push button selector switch. The gage seems to go to full with even very low voltage.

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19 May 2019 17:15 #37270 by Lee Carr
Replied by Lee Carr on topic 812 Fuel Gage
I took the senders out for bench test so the wires in the car are not a cause. I connected the gage and the senders in a bench test with no car wiring. Thanks for helping.

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19 May 2019 17:17 #37271 by Lee Carr
Replied by Lee Carr on topic 812 Fuel Gage
The system did work correctly for more than 10 years - this is a change.

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